High velocity hot air dryer assembly



Aug- 1957 R. L. HISERMAN, JR 2,803,390

HIGH VELOCITY HOT AIR DRYER ASSEMBLY Original.Filed Dec. 30, 1955 v 99 mm WW w T H /m Q AU AU W 5 1 NW '1 V 1| lwllllllllilllll g i H I km 0 w/ A m 0 IIIIIIIIQ 0 v L N I NVENT OR H/SERMA/VJR ATTORNEYS United States Patent HIGH VELOCITY HOT AIR DRYER ASSEMBLY Russell L. Hiserman, In, Los Altos, Calif., assignor to the United States of America as represented by the Secretary of the Navy Original application December 30, 1955, Serial No. 557,219. Divided and this application January 18, 1956, Serial No. 560,042

1 Claim. (Cl. 34-160) (Granted under Title 35, U. S. Code (1952), sec. 266) The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.

This is a division of my copending application Serial No. 557,219 filed December 30, 1955.

The present invention relates to a high velocity hot air dryer assembly and more particularly to a twin-type high velocity hot air dryer assembly having four air outlets.

An object of the present invention is to provide a dryer assembly for photographic film or the like in which hot air, issuing at high velocity, serves to dry the film.

Another object is to provide a dryer assembly in which a stream of air always exists between the film and the material of the dryer, to prevent contact of the film with the dryer material.

A further object of the present invention is the provision of a dryer assembly for film or the like which permits rapid movement of the film while passing through the dryer assembly.

Other objects and many of the attendant advantages of this invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings wherein:

Fig. 1 is an elevation, with parts broken away, of a pair of high velocity hot air dryers constituting a preferred embodiment of the invention, and

Fig. 2 is a cross-sectional view taken on the line 2-2 of Fig. 1.

Referring now to the drawings, wherein like reference characters designate like or corresponding parts through out the several views, there is shown in the Fig. 1 a dryer assembly comprising a pair of identical high velocity hot air dryers 83 and 84, dryer 84 being shown fragmentarily. The dryers 83 and 84 are slightly spaced, as shown.

In the figures, dryer 83 may be seen to have a top plate 86 to which are attached two side plates 87 and 88 which are chamfered at their lower edges 89 and 90. Between side plates 87 and 88 extends a divider plate 91, having spaced holes 92 therein. On either end of dryer 83 are two end plates, one of which, end plate 93, has a threaded hole 94 therein. The top plate 86, side plates 87 and 88, divider plate 91 and the end plates constitute a plenum chamber 95. A strengthening plate 96 having a series of large holes 97 therein, and being cut away opposite hole 94, extends between top plate 86 and divider plate 91.

Attached to divider plate 91 opposite to strengthening plate 96 by recessed screws is a support plate 98 to which is secured a nozzle plate 99 having chamfered edges 100. The edges 100 and 89 are spaced a short distance, approximately .0015, and form the exit surfaces for the hot air.

In operation, hot air from any suitable source is introduced into the dryers 83 and 84: hot air is introduced into dryer 83 through hole 94, fills plenum chamber 95, flows through the holes 92 in divider plate 91 and thence out the spaces between edges 100 and 89 and 100 and 90. Hot air issues from these spaces at a very high velocity. It will be readily understood that each dryer has two exit spaces, so that four high velocity streams impinge upon the film to facilitate rapid drying thereof, and the fast movement of the film through the dryer assembly.

Obviously many modifications and variations of the present invention are possible in the light of the above teachings. It is therefore to be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described.

What is claimed is:

In a high velocity hot air dryer for photographic film or the like, a body having a generally rectangular top plate, side plates and end plates extending therefrom, an inlet opening on one of said end plates, a divider plate parallel to said top plate and extending from intermediate points on said side and end plates, whereby to form a plenum chamber, a nozzle plate parallel to said top plate and disposed on the opposite side of said divider plate from said top plate, said side plates and said nozzle plates having juxtaposed beveled edges, whereby to form a pair of slit outlets, and communicating passages in said divider plate, whereby hot air under pressure may enter said inlet, fill said plenum chamber and pass therefrom to and through said slits at a high velocity.

References Cited in the file of this patent UNITED STATES PATENTS 2,033,069 Hagen et al. Mar. 3, 1936 2,402,545 Frum Jan. 29, 1944 2,736,107 Dungler Feb. 28, 1956 

